The Oscar-nominated British actress explained that being cast in The Great Gatsby more than a year ago allowed her plenty of time to research the life of author F Scott Fitzgerald and his wife Zelda Fitzgerald.

"It's been really good because I got the job last November so I had a year before we started shooting," she said.

"I had so much time to read about Fitzgerald and Zelda. It felt like by the time we got filming we'd all prepared as much as we could."